scaling of saltstone disposal facility testing - …€¦ · scaling of saltstone disposal facility...
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1S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
SCALING OF SALTSTONE DISPOSAL FACILITY TESTING
December 15, 2015
Kent RosenbergerPerformance and Risk Assessment Community of Practice Annual Technical Exchange
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2S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Performance Assessments
� Saltstone Disposal Facility is a low-level waste disposal facility which incorporates liquid low-level waste from the SRS Tank Farms with cement, fly ash and slag to form cementitious waste form - saltstone
� Liquid waste and dry feeds mixed in the Saltstone Production Facility and saltstone pumped to the disposal units in the Saltstone Disposal Facility
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3S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Legend:ARP Actinide Removal Process
MCU Modular Caustic Side Solvent Extraction Unit
DWPF Defense Waste Processing Facility
GWSB Glass Waste Storage Building
SWPF Salt Waste Processing Facility
DWPFDWPF
Sludge waste
Tanks Cleaned and Closed
Salt waste
DWPF
(under construction)
Decontaminated Salt Waste
GWSBSaltstone Disposal
Facility
MCU
ARP
SWPF
Salt
Processing
SRS Liquid Waste System
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4S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Saltstone Facilities
8-25-2015
Saltstone ProductionFacility
SDUs 3/5
SDU 2
SDU 4 SDU 1
SDU 6
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5S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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� SDF been operating since 1990.
�As discussed in previous presentation the modeling results are used to inform R&D activities
Saltstone Disposal Facility
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6S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Testing related to the Saltstone Disposal Facility
has been performed at the molecular level, at
laboratory scale / predictive modeling and at the
disposal unit scale.
Scale of Testing
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7S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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• Testing at each scale consists of inherent pros
and cons.
• Need to evaluate those pros and cons with the
anticipation of wanting testing to focus on the
laboratory scale supported by predictive
modeling.
Scale of Testing
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8S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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• Focus on information needed to support
laboratory scale testing and predictive
modeling.
• Fe, Tc, S speciation using X-Ray Absorption
Spectroscopy, Scanning Electron Microscopy &
Energy Dispersive Spectroscopy to investigate
phase and microstructure
Testing on Molecular Scale
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9S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Scanning Electron Microscopy/Energy Dispersive Spectroscopy
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X-Ray Diffraction
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11S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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X-Ray Absorption Spectroscopy
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12S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Pros Cons
Detailed understanding of
physical properties.
Looking at small sample
section making it difficult to
judge applicability to large
facility.
Costs and/or availability of
equipment and facilities.
Cementitious material not
homogeneous.
Specialized analysis.
Testing on Molecular Scale
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13S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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• Focus on information needed to support laboratory scale
testing and predictive modeling.
Testing on Disposal Unit Scale
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14S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Mock-Ups
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Procedures, Training, Personnel
ProceduresDeveloped New Procedure based on Mock up Activities
Conducted tabletop review with entire team prior to implementation (20
hours)
TrainingDeveloped Training Plan and Analysis
Developed OJT / JPM
Conducted Training for target operators and backups
Incorporated support organizations in mockup and training activities
Materials and EquipmentInvestigated capabilities of various drill motors and drill bits
Developed and fabricated anaerobic chamber for storage at laboratory
Developed and fabricated core extraction tools
Developed and fabricated anaerobic transportation tubes
Developed grout monolith to mimic SDU 2A grout pours
Qualified new transportation containers for shipment
Fabricated containment huts over SDU 2A Risers
Fabricated shielding plates for drill and camera access
BriefingsConducted daily pre-job, post job & lessons learned briefings
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16S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Cell Access: Containment Huts
Main hut: 12’w x 15’l x 12’h
Air lock: 12’w x 5’l x 12’h
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17S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Summary of Dose Received
Camera Port Dose
(mrem)
Preparation and Support 822
A 716
B 587
C 589
TOTAL���� 2,714
NOTE: Doses do not include demobilization
Highest Individual Dose
• Core Drill 253 mrem
• Preparation & Support 144 mrem
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18S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Pros Cons
Represents actual waste
form cured under actual
disposal conditions.
Looking at snap shot of
material properties in time.
High cost in terms of dollars,
radiological exposure,
schedule and human capital.
Testing on Disposal Unit Scale
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19S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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• Lab scale testing has been ongoing for almost 30
years.
• Hydraulic conductivity, distribution coefficients,
semi-dynamic leaching, dynamic leaching,
physical properties, heat of hydration,
chemically-induced degradation are tested at
lab scale over a range of conditions
• Predictive modeling used as supported by lab
analysis including solubility limits (Geochemist
Workbench) and cementitious material
degradation (CBP Toolbox).
Testing on Laboratory Scale
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0 50 100 150 200 250 300 350
30
40
50
60
70
Time (Days)
Tem
per
atu
re (
oC
)
Simulating SDU Environment
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21S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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EPA Leaching Studies
0 20 40 60 80
0
2
4
6
8
10
Nitrate
Tc
Re
Time (Days)
Cu
mu
lati
ve
Ext.
(%
)
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22S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Dynamic Leaching
0.0
0.1
0.1
0.2
0.2
0.3
0.3
0.4
0.4
0.5
0.0 0.5 1.0 1.5 2.0 2.5
Tc
Lea
che
d (
% o
f T
ota
l T
c S
pik
e)
Cumulative Sample Pore Volumes Exchanged
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23S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Fresh Properties
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24S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Pros Cons
Allows testing over wide
range of conditions.
Need support by other
testing scales to provide
laboratory scale validity.
Relatively inexpensive
compared to other testing
scales.
Smaller scale sample
processing may not mimic
field processing
(different mixer type,
transfer, drop into tank,
etc.)
Testing on Laboratory Scale
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25S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Testing on Laboratory Scale
• Smaller scale processing – in SPF saltstone is
mixed in a high shear mixer for a few minutes
and then pumped down a transfer line and
dropped in an SDU; in the lab the mixing
technique is often different and the grout is not
subjected to line transfer and drop.
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26S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Lab-Scale Plus
• Mimic “true” processing to extent feasible.
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27S AVANNAH R I V E R S I T E • A I K E N , S C • www. S RRemed i a t i o n . c om
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Conclusions
• A comprehensive testing program should include
facets at various scales to provide the level of
model support necessary to reduce performance
assessment uncertainty.
• Pros and cons of testing scales should be
examined with anticipation of bulk of testing on
the laboratory scale / predictive modeling.